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  • Technical and economic demands of HVDC submarine cable technology for Global Energy Interconnection

    2020-05-15

    Xiaoling Zhao, Yao Liu, Jiawei Wu, Jinyu Xiao, Jinming Hou, Jinghui Gao, Lisheng Zhong

    2020, 3(2): 120-127 pdf html

    Power transmission across the sea is an important part of global energy interconnection (GEI).To support the construction of GEI and to serve the needs of future clean energy trans-sea transportation and offshore wind power development, this study a) analyzes the requirements of the GEI backbone network pertaining to direct current (DC) submarine cable technology, and b) defines the key technical and economic indices of ultrahigh-voltage direct current (UHVDC) submarine cable based on theoretical computations.The research is based on the thermoelectric coupling model and the finite element method.It is shown that the dielectric strength of the insulating materials of the ±800 kV~±1100 kV/ 4000 MW~12000 MW UHVDC submarine cable (extrusion insulation) should be not less than 43~65 kV/mm, while the heat resistance is not less than 110 °C.As the cost of submarine cable is 5~10 times higher than that of the overhead line, the project investment need to be decreased to a level within the economical carrying capacity to guarantee extensive applicability of the HVDC submarine cable technology.

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  • Joint electricity and carbon market for Northeast Asia energy interconnection

    2020-05-15

    Tao Ding, Runzhao Lu, Yiting Xu, Qingrun Yang, Yuanbing Zhou, Yun Zhang, Ya Wen

    2020, 3(2): 99-110 pdf html

    Decarbonization of the electricity sector is crucial to mitigate the impacts of climate change and global warming over the coming decades.The key challenges for achieving this goal are carbon emission trading and electricity sector regulation, which are also the major components of the carbon and electricity markets, respectively.In this paper, a joint electricity and carbon market model is proposed to investigate the relationships between electricity price, carbon price, and electricity generation capacity, thereby identifying pathways toward a renewable energy transition under the transactional energy interconnection framework.The proposed model is a dynamically iterative optimization model consisting of upperlevel and lower-level models.The upper-level model optimizes power generation and obtains the electricity price, which drives the lower-level model to update the carbon price and electricity generation capacity.The proposed model is verified using the Northeast Asia power grid.The results show that increasing carbon price will result in increased electricity price, along with further increases in renewable energy generation capacity in the following period.This increase in renewable energy generation will reduce reliance on carbon-emitting energy sources, and hence the carbon price will decline.Moreover, the interconnection among zones in the Northeast Asia power grid will enable reasonable allocation of zonal power generation.Carbon capture and storage (CCS) will be an effective technology to reduce the carbon emissions and further realize the emission reduction targets in 2030-2050.It eases the stress of realizing the energy transition because of the less urgency to install additional renewable energy capacity.

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  • Research on power electronic transformer applied in AC/DC hybrid distribution networks

    2020-05-17

    Yiqun Miao, Jieying Song, Haijun Liu, Zhengang Lu, Shufan Chen, Chun Ding,Tianzhi Cao, Linhai Cai, Yuzhong Gong

    2018, 1(3): 396-403 pdf html

    The AC/DC hybrid distribution network is one of the trends in distribution network development, which poses great challenges to the traditional distribution transformer. In this paper, a new topology suitable for AC/DC hybrid distribution network is put forward according to the demands of power grid, with advantages of accepting DG and DC loads, while clearing DC fault by blocking the clamping double sub-module (CDSM) of input stage. Then, this paper shows the typical structure of AC/DC distribution network that is hand in hand. Based on the new topology, this paper designs the control and modulation strategies of each stage, where the outer loop controller of input stage is emphasized for its two-control mode. At last, the rationality of new topology and the validity of control strategies are verified by the steady and dynamic state simulation. At the same time, the simulation results highlight the role of PET in energy regulation.

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  • Global Energy Interconnection: an effective solution to climate challenges

    2020-05-17

    Junfeng Li, Siyu Jiang

    2018, 1(4): 406-408 pdf html

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